In the GP's defense I had a 98 W body regal with almost every option accept the GS package and the sunroof.... the only things I can think of that it had that my current GP doesn't have was auto dimming mirrors, defrosting mirrors, back doors and the part I loved the most the huuuuge cubby hole under the AC controls that I honestly could house everything in ever inside of, kept like 3 pairs of sunglasses and a GPS in there at all times. Asside from the the suspension was a lot squishier, as were the seats which also had heated driver and passenger rather than just heated driver, and the concert 2 sound system wasn't as good as the bose my GP has. Otherwise, my stereo and AC controls are the exact same as my Regals were, the seats are electric on both cars, now the back seats those were different, granted I went from the 4 door regal to my two door GP. Things my GP has that my 98 regal didn't. Steering wheel contols, Heads up display, a button in the glove box that opens my trunk, polished aluminum wheels, dual exhaust, bose sound system (which isn't amazing but is better than concert 2). I will say some days I miss the sheer couch like feel my Regal seemed to have, like driving around in a big lounge chair with wheels lol